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Given that we have collected pairs of observations on two variables X and Y , we would consider fitting a straight line with X as an explanatory...

Given that we have collected pairs of observations on two variables X and Y , we would consider fitting a straight line with X as an explanatory variable if:
a. the change in Y is an additive constant.
b. the change in Y is a constant for each unit change in X
c. the change in Y is a fixed percent of Y
d. the change in Y is exponential

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